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Old 08-14-2009, 10:59 AM #1
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Default Projector Glass Window

Anyone know of somewhere I can buy some glass to cover the laser exit hole on my scanner? The hole is 1.5x1.5" so something slightly larger would be perfect.

Im not sure where to look for this stuff.


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Old 08-14-2009, 12:11 PM #2
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Default Re: Projector Glass Window

AR coated glass is commonly also used for camera's, you could start there
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Old 08-14-2009, 03:10 PM #3
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Default Re: Projector Glass Window

a camera filter is what most people use.

subject to your budget you could get a good quality one.

obviously cameras need good qualty optics to take good pics
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Old 08-14-2009, 06:56 PM #4
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Default Re: Projector Glass Window

Cheapest ones may be those called "anti-UV" ..... are usually perfectly transparents to visible light, AR broadband coated, and cost not too much (lots of peoples uses them as "lens protections" ).

EDIT: ofcourse, supposed that your scanner don't use a BR as blue part, being BR most in the UV

An alternative solution can be to find an old, massacred photocopier, one of these that have an incandescent lamp or a neon, not the led types ..... 99% of the times, the plane of glass is AR coated
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Old 08-14-2009, 09:13 PM #5
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Default Re: Projector Glass Window

Quote:
Originally Posted by HIMNL9 View Post
An alternative solution can be to find an old, massacred photocopier, one of these that have an incandescent lamp or a neon, not the led types ..... 99% of the times, the plane of glass is AR coated
That's sweet! I'll have to look into that. I have glass cutters, one pane should break down into 25-30 smaller squares big enough to use with a scanner.
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Old 08-14-2009, 09:50 PM #6
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Default Re: Projector Glass Window

I use a camera lens protector. Might be a UV filter, but I can't remember. I bought an adapter ring and epoxied to a piece of aluminum and mounted that to my projector. So, I can unscrew and replace/clean my lens protector whenever it gets dirty. It's really nice.
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Old 08-14-2009, 11:59 PM #7
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Default Re: Projector Glass Window

Elektro, the problem is that the laser would deflect all over the place where the glass has been cut ...

BR is 405nm, so it _barely_ qualifies as UV (High UV starts at around 400nm), so it may be alright.
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Old 08-15-2009, 12:56 AM #8
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Default Re: Projector Glass Window

Nah. When you cut glass with a glass cutter, it would end up being smaller square pieces of glass with clean 90 degree corners (if you do it properly anyway). You would do this to avoid having to strap the entire pane of copier scanning bed glass (let's say 18x20 inches) to the front of the scanner. If you cut these smaller pieces so that the glass is wider than the lasers' scan area, how exactly would the edges be involved?
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Old 08-15-2009, 01:04 AM #9
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Default Re: Projector Glass Window

It might if you cut it with a taco.
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Old 08-15-2009, 02:08 AM #10
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Default Re: Projector Glass Window

Ooooooooooooooohhhhhhhhhh, sorry, I thought you meant it was a little strip of glass >.<
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Old 08-15-2009, 11:36 AM #11
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Default Re: Projector Glass Window

i looked around a good while to find AR-coated glass.
i tested several "uv blocking cameralenses", they all reflect much worse than my glasses, for example. and get really expensive too. no way to tell how well they are AR-coated before holding them in your hands, the ads are close to lieing..

however:
there are extremely well coated "lenses" for flashlights, called "UCL" for "ultra clear lens". many different sizes, all round of course, several strengths as well:
UCLŪ Lens

i got one around 50mm, a bit less than 2mm strength i think. it was easy to cut with a common glasscutter. both sides are AR-coated, and wow, what a coating! much better than my (too expensive) ar-coating on my glasses, you barely see the reflection on a lightbulb! its like you hold something in your hand, you feel it, but cant see it! its pretty impressive!
the coating is pretty tough too, gently rubbing it to clean is no problem.

holding it into a laserbeam, i cant surely measure any difference in power at all.

a 100mw green laser has so little reflection that you dont see a second dot at all.

well, i guess i already convinced you a page ago, for less than 10$ a piece.. but damn, this stuff amazes me! :-)

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Old 08-15-2009, 01:47 PM #12
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Default Re: Projector Glass Window

I bought some 1.5" windows here for my scanner project a while back.
Prec Optics-Windows - Surplus Shed

hope this help have good day ! Pyro...
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Old 08-15-2009, 02:30 PM #13
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Default Re: Projector Glass Window

ElectroFreak, check the glass, if you want to try with the photocopier one, cause the "new types" of photocopiers, having led lightning at a big angle respect the reading lens, are not more AR coated ..... only old types had this coating, cause the use of incandescent lamps and neon tubes was causing a lot of problems with the reading angles ..... the new, cheap ones, probably, not uses AR coating anymore, unfortunately

Anyway, i still find something useful, time by time, in big assistance centers, that manage industrial types copiers ..... for that use, is enough a piece of glass, so maybe is enough ask them to save a piece of it, the first time they have to change a broken one, and usually this comes for free (instead, asking for a full panel, maybe they sell you it as spare part, and is not cheap)
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Old 08-17-2009, 10:28 AM #14
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Default Re: Projector Glass Window

Just throw the photocopier on hard concrete. Pick up the pieces of glass and make a mosaic projector. J/K
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